Storage & stability
Peptide storage reference.
Peptides are temperature- and light-sensitive. The right storage protocol meaningfully extends usable life and protects potency.
Lyophilized (unmixed)
−20°C freezer · long-term
Sealed lyophilized vials are typically very stable. Long-term storage at −20°C or below; short-term cold-chain shipping at 2–8°C is fine.
Reconstituted
2–8°C refrigerator
Once mixed with bacteriostatic water, store upright in the fridge. Most peptides remain stable for several weeks; some are shorter — always defer to product literature.
Long-term frozen aliquots
−20°C or colder
For extended storage, aliquot into smaller sterile vials and freeze. Avoid repeated freeze/thaw cycles — they degrade peptide integrity.
✓ Do
- Refrigerate immediately after reconstitution.
- Store upright to keep the rubber stopper wet.
- Protect from direct light — keep vials in their box.
- Label with reconstitution date and water volume.
- Allow vials to equilibrate to room temperature before handling if recommended by supplier documentation.
✕ Don't
- Don't leave reconstituted vials at room temp for hours.
- Don't freeze BAC-water-reconstituted vials repeatedly.
- Don't expose to direct sunlight or hot car interiors.
- Don't shake to "mix faster" — gentle swirl only.
- Don't reuse a vial past its stability window.
Cold chain matters
A few hours warm during shipping is usually fine. Repeated warm/cold cycles are not.
Light is the enemy
Many peptides are photosensitive. Keep them in their original carton or an opaque container.
Track the clock
Most reconstituted peptides remain stable 2–4 weeks refrigerated, but check product-specific data.
For concentration reference, the Reconix calculator models peptide mass and diluent volume.
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